The control board indicates the faults detected by
means of the red LED V3 on the board or the fault
codes indicated on the DPC-1 thermostat.
N O T E
For further information, see the technical information
on the YKN2 Open control board.
Rotational direction of Scroll compressors
The Scroll compressors only operate correctly in one direction of rotation. Although these units are
protected by a phase order detector, when the unit is started, check that the unit rotates in the correct
direction. If it is not correct:
If the compressors are not connected correctly and are rotating in the wrong direction:
• The compressor will not compress.
• Operating noise will be abnormal.
• Electricity consumption (A) will be low.
• They overheat.
The phase detector must have both LEDs lit for correct operation:
• Green LED lit means: Power ON.
• Yellow LED lit means: Relay ON.
1.12 Unblocking the unit safely in case of breakdown
D A N G E R
• All side panels except for that of the electrical box, must be fitted, closed and secured with their
corresponding locks before turning the general switch on the unit.
• The unit has a remote control, which means that the fan turbine may start unexpectedly.
To unlock the unit, see "Restarting the air conditioning unit in the case of damage" in the User Manual.
If the thermostat display keeps showing the pilot light
-1- and any fault code -2- or if the air conditioning unit
does not start, contact a Johnson Controls Inc.
Authorised Technical Assistance Service.
Y2 O/B Y1
G
X1
B
R
AUTO
AUTO
ºC
1
2
1
Installation manual
1.12 Unblocking the unit safely in case of breakdown
42
